package com.mmall.service.impl;

import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.mmall.common.ServerResponse;
import com.mmall.dao.CategoryMapper;
import com.mmall.pojo.Category;
import com.mmall.service.ICategoryService;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Set;

/**
 * Created by geely
 */
@Service("iCategoryService")
public class CategoryServiceImpl implements ICategoryService {

  private Logger logger = LoggerFactory.getLogger(CategoryServiceImpl.class);

  @Autowired
  private CategoryMapper categoryMapper;

  public ServerResponse addCategory(String categoryName, Integer parentId) {
    if (parentId == null || StringUtils.isBlank(categoryName)) {
      return ServerResponse.createByErrorMessage("添加品类参数错误");
    }

    Category category = new Category();
    category.setName(categoryName);
    category.setParentId(parentId);
    category.setStatus(true);//这个分类是可用的

    int rowCount = categoryMapper.insert(category);
    if (rowCount > 0) {
      return ServerResponse.createBySuccess("添加品类成功");
    }
    return ServerResponse.createByErrorMessage("添加品类失败");
  }

  public ServerResponse updateCategoryName(Integer categoryId, String categoryName) {
    if (categoryId == null || StringUtils.isBlank(categoryName)) {
      return ServerResponse.createByErrorMessage("更新品类参数错误");
    }
    Category category = new Category();
    category.setId(categoryId);
    category.setName(categoryName);

    int rowCount = categoryMapper.updateByPrimaryKeySelective(category);
    if (rowCount > 0) {
      return ServerResponse.createBySuccess("更新品类名字成功");
    }
    return ServerResponse.createByErrorMessage("更新品类名字失败");
  }

  public ServerResponse<List<Category>> getChildrenParallelCategory(Integer categoryId) {
    List<Category> categoryList = categoryMapper.selectCategoryChildrenByParentId(categoryId);
    if (CollectionUtils.isEmpty(categoryList)) {
      logger.info("未找到当前分类的子分类");
    }
    return ServerResponse.createBySuccess(categoryList);
  }


  /**
   * 递归查询本节点的id及孩子节点的id
   *
   * @param categoryId
   * @return
   */
  public ServerResponse<List<Integer>> selectCategoryAndChildrenById(Integer categoryId) {
    Set<Category> categorySet = Sets.newHashSet();
    findChildCategory(categorySet, categoryId);


    List<Integer> categoryIdList = Lists.newArrayList();
    if (categoryId != null) {
      for (Category categoryItem : categorySet) {
        categoryIdList.add(categoryItem.getId());
      }
    }
    return ServerResponse.createBySuccess(categoryIdList);
  }


  //递归算法,算出子节点
  private Set<Category> findChildCategory(Set<Category> categorySet, Integer categoryId) {
    Category category = categoryMapper.selectByPrimaryKey(categoryId);
    if (category != null) {
      categorySet.add(category);
    }
    //查找子节点,递归算法一定要有一个退出的条件
    List<Category> categoryList = categoryMapper.selectCategoryChildrenByParentId(categoryId);
    for (Category categoryItem : categoryList) {
      findChildCategory(categorySet, categoryItem.getId());
    }
    return categorySet;
  }


}
